Adjusting stopping-position of shuttles of power looms



June 14, 1932. K. SAKAMOTO 1,863,127

ADJUSTING STOPPING POSITIONS OF SHUTTLES OF POWER LOOMS Filed Aug. 25, 1930 w m M @w Q W MM 7 W% V L QM? Patented June 14, 1932 PATENT OFFICE KYUGORO SAKAMO'IO, OF HAMAMATSU, JAPAN ADJUSTING STOPPING-POSITION OF SHUTTLES OF POWER LOOMS Application filed August 23, 1930, Serial No. 477,435, and in Japan August 31, 1929.

This invention relates to improvements in an apparatus for adjusting the stopping position of a shuttle of a power loom.

The object of this invention is to provide a means wherein a buffer-band can be easily adjusted as to tension, and an adjustable cushion spring is arranged relative to the buffer-band so that the extreme position of a shuttle-beater or stick, consequently that of the shuttle at each end of its motion, is correctly adjusted so that change of shuttles or cops is made in the correct position.

In the accompanying drawing, Fig. 1 is a side elevation of an end portion of a lathe of a power loom according to this invention.

Fig. 2 is a sectional plan view of a buffer holder, the lathe body being removed.

Fig. 8 is an end view of the same.

Referring to the drawing, the lathe and the buffer holder are made in the well known manner, so that no detail explanation of these members would be required.

A bufler holder 1 is fixed to each end of the lathe and a buffer band 2 made of leather or fabric is fixed to the holder by a pin 3, and a slidable cushion piece 4:, which is guided in a slot of the holder, is fixed to the band at its outward extreme end. This arrangement is a well known construction of a buffer holder of a power loom.

According to this invention, the buffer band is guided by four rollers 5 arranged in side of the band and rotatively mounted in the holder. The band is pressed inwards by curved springs 6 which are held in slots 7 of the holder at its central portion, and the springs, in turn, are pressed by means of two pairs of blocks 8 with bevel face. Each block 8 is held in a horizontal slot 9 in the holder, and can be easily adjusted as to its position along the slot 9.

At the outer end of the buffer holder 1 is provided a cushion member 10, which is yieldably held on an angular piece 12 by means of a helical spring 11, and the piece 12 is fixed on the holder, but is adjustable in its position along the slot 13. The cushion member 10 is in contact with the cushion piece 4:, and co-operates against the impulse of the stick 14. The strength of the helical spring also can be adjusted by nuts 15.

During operation of the loom, the extreme position of the shuttle may be changed due to wear of picker, elongation or shrinkage of band, and so on. In that case the tension of the band may be adjusted by the blocks 8, that is, if the blocks are moved to their outward position, the band 2 is pressed harder against the spring 6 and the rollers 5 so as to increase friction at the contact surface. At the same time, the band is curved sharper between each pair of rollers, so that the extreme position of the stick or shuttle is brought inwardly. If the angular piece 12 is adjusted so as to change the position of the cushion piece 10, the same result can be ob tained. By this means the tension of the cushion and the extreme position of the shuttle can be easily adjusted. Since the springs 6 contact the band upon a broad surface, the pressure due to the blocks 8 is distributed to the broad surface of the band, so that wear of the band at one point only is avoided.

I claim:

An apparatus for adjusting the position of a shuttle in a power loom comprising a buffer holder, a cushion member adjustably mounted upon said holder, a buffer band positioned in said holder, rollers located upon said holder inside said band, curved spring plates located between said band and said holder urging said band towards the interior of said holder and cam members operating against said springs for varying the tension of said band.

In testimony whereof I aflix my signature.

KYUGORO SAKAMOTO. 

